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According to the Magic Circle spell description, you can reverse the spell while casting it so that a creature of a chosen type is trapped in the circle (without a saving throw) and creatures outside of it are given some pretty good buffs.

When you cast this spell, you can elect to cause its magic to operate in the reverse direction, preventing a creature of the specified type from leaving the Cylinder and protecting Targets outside it.

Buffs are:

  • The creature has disadvantage on Attack rolls against Targets within the Cylinder.
  • Targets within the Cylinder can't be Charmed, Frightened, or possessed by the creature.

Although the circle itself has a range of 10-feet, the buffs do not have a range in the case of an inverted circle. Is it essentially just infinity then? This seems... exploitable.

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Yes, the range of the buffs is effectively infinite. But they only work against the creature in the cylinder. Substituting the reversed benefits:

  • The creature can't willingly enter leave the cylinder by nonmagical means. If the creature tries to use teleportation or interplanar travel to do so, it must first succeed on a Charisma saving throw.
  • The creature has disadvantage on attack rolls against targets within outside the cylinder.
  • Targets within outside the cylinder can't be charmed, frightened, or possessed by the creature.

Narratively speaking, they're really limits on the creature, not buffs to everyone else. In terms of exploits, about the only one I can think of is trapping a creature to free everyone it currently has charmed, no matter where they are. Which is kind of cool, but hardly overpowered.

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    \$\begingroup\$ @RobRose As cool as that would be, the casting time of a minute is likely to present some problems... \$\endgroup\$ – Miniman Nov 20 '17 at 3:43
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    \$\begingroup\$ @RobRose That's not an unintuitive exploit. Locking a psychicly active brain within in a magic psychic-power-stopping prison sure seems like a reasonable way of suppressing it. \$\endgroup\$ – the dark wanderer Nov 20 '17 at 7:38
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    \$\begingroup\$ It's not a bug, it's a feature! Trapping a monster in a magic circle to block its influence is one of the classic uses of a magic circle. \$\endgroup\$ – Darth Pseudonym Nov 20 '17 at 20:19
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    \$\begingroup\$ @miniman But not if you used a ring of spell storing or a glyph of warding loaded with the spell, right? \$\endgroup\$ – KorvinStarmast Nov 20 '17 at 21:05
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    \$\begingroup\$ @KorvinStarmast Well, elder brains don't tend to move around, so glyph would be tricky, but the ring seems good. \$\endgroup\$ – Miniman Nov 20 '17 at 21:35

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